I had the same problem Munn, all you need to do is wait until you have to look at the script at your agents office. When you click it it will say The Big Screen. a few things that might trigger this event happening: 1) talk to arnie 2) do a few more requests 3) wait until you have to do the Where's The Beach (thats when i got the script) I hope this comment helps! Good Luck!
Source: http://www.chaptercheats.com/qna/iphone-ipod/113548/Stardom-Hollywood-Answers.htm?qid=57005 ChapterCheats